Transmission



C. GERST TRANSMISSION March 423, 1954 2 Sheets-Sheet l Filed MarCh 7, 1951 MN5/vm@ CHR/5 55H57' 'arr March 23, 1954 c. GERST 2,672,769 TRANSMISSION Filed March '7. 1951 2 Sheets-Sheet 2 Patented Mar. 23, 1954 This invention relates -to power L,transmission mechanism and, While not limitedfthereto, has special reference to .gearing Afor-vehicles including individual Vpower units :and devices driven thereby, as `for example road machinery with in- M dividual power units and devices driven thereby, such 'as truck `mixers with a power unitfor driving and actuatinga mixing drum.`

The general objectrof; the invention is the provision of `an improved powerltransmissionconi structed 'to permitI control `and-reversal of its output shaft by aA single reversing transmission of the planetary type,:which transmission has its clutch structure. positioned tadjacentgto the main housing of the-transmission .tofsimplify assembly n and repair operations. i

Another object; of theinvention-isgthe provision of an improved reversible transmissionvyconstructed to 'permit ,equalpreduction of the, speed ofits output shaft i fory `forward)and reversedrive i by a single reversing transmissionitofx-the planetary type, the utransmission': having its clutch structure positioned adjacent to thermal-n housing to simplify assemrblyiandrepairoperations\ v4 claims. (clear-Tiss n 1 i Referring, new.

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vision of an `.improved reversible torquefconverter type transmission f embodying; gearingt coupled with a torque converter ,arrangedsadjacent to one side of the mainhousing ofrthetransmission to permit directcoi 1p1ir1g o:

theplanetary type constructed-to permitforvvard and reversedrive of the-outputA-shaft qfithectransmission which hasthe.reversingtransmission arranged at another iside a device to loe driven.

In addition the rinventionnfhas iotherqm-arked superiorities which zclearly; distinguishit from presently known` structures. vvThese irrrprovements 01superiorities,embodying certainr Ynovel features of construction, are `clearlyiset forth" yin the following specication Vand the `appended claims;` and a, preferred form Vofembodiment-k of the invention is hereinaftershown Withreference,

to the accompanyingdrawngsforming partici the speeincation.. n

In the drawings:

Fig. lis a longitudinalsectional` .view ,through a reversible, torqueconverten typeftransmissionu.. constructed in1 accordance withr the invention; the

section hein'gtakenLon" line JL-I :ofl Fig; 2';

Fig. 2 is a transverse#sectional `vie`w= through Fig: 1, theseetionjvbeing the `torlquerconverter A with .an engine anda reversing transmission of y,offlthe main ghou'sing. to" 1 `permit direct coupling of'such transmission with chamism` 0. ar- 118 a curled cris/e4,

backing mat illy .ot lpaser 'iiandeanflinternally sp1-inked tportion i f alfringfigeariu `LTherinmgfear;formsAaapart a planet gear carrier 43 which is extended from base 33 as an integral part thereof.

Planetary drive arrangement 42 includes a sun gear 44 formed as an integral part of a tubular shaft 45 which has its splined portion 46 coupled with an internally splined tubular end portion 41 of hub 48 on large gear 25. Tubular shaft 45 is recessed at 50 and seats the outer race of a ball bearing having its inner race mounted on output shaft 26, so as to freely rotatably mount shaft 45 on output shaft 26. y

Sun gear 44 meshes with a set of three planet gears 52 which are rotatably supported on stud shafts 53 mounted on the planet gear carrier 43. Planet gears 52 mesh with a second set of three planet gears 54 rotatably supported on stud shafts 55 also mounted on planet gear carrier 43. Planet gears 54 mesh with ring gear 4| which is rotatably supported on tubular shaft 45 by ball bearings 56, 51. The ring gear 4| is provided with a circumferential flange 58 partly encircling base 33 of disk clutch 34. Flange 58 which as stated is splined at 39 and slidably and non-rotatably supports the friction disks 38 permits frictional coupling of ring gear 4| with output shaft 26 when clamping plate 36 of clutch structure 34 is shifted against the force of spring 60 toward backing plate 35 for frictional engagement of friction disks 31 and 38 with each other. Such shifting of clamping plate 36 is effected by a cylinder-piston-like arrangement 6| including a cup-shaped member 62 fluidtightly mounted on the splined portion 63 of base 33, which cup-shaped member slidably supports in its cylinder-like recess 64 the pistonshaped clamping plate 3 A shifting of clamping plate 36 toward backing plate 35 is effected when pressure fluid from fluid pump 94 mounted in front of housing 2 enters through pipe 65 and passages 66 and 61 into the cylinder-like recess l.

64 of cylinder-piston-like arrangement 6|, and shifting of clamping plate 36 in the opposite direction is effected lby spring 66 when the pressure fluid in recess 64 is discharged from said recess through passages 61, 66, and a four-way valve structure 88 (later to be described) into a'sump 95 acting as a fluid reservoir for pump 94 which draws fluid therefrom through intake pipe 96.

The described power transmission provides a reversible speed reduction drive arrangement between input shaft |4 and output shaft 26. The drive arrangement effects a reduced forward rotation of output shaft 26 when disk clutch 34 is actuated and brake arrangement 68 (later to be described) is inactivated, as then input shaft |4 transfers its rotation through torque converter 1 to gear drive 4, thence through large gear 25 to tubular shaft 45 and sun gear 44, and finally through planet gears 52 and 54 to ring. gear 4| which by clutch 34' is coupled with output shaft 26. A reverse rotation of output shaft 26 is effected by the drive arrangement when clutch 34 is released and the referred to brake arrangement 68 is activated. In this latter case planet gears 54 roll on arrested ring gear 4I and by rotation of planet gear carrier 43 and base 33 effect a reverse rotation of output shaft 26.

In the described construction the planetary transmission mechanism controls forward and reverse rotation of the output shaft 26, forward rotation being effected by coupling the ring gear 4| through disk clutch 34 with the output shaft, and reverse rotation being effected by arresting rotation of ring gear 4| and releasing disk clutch 34. In the lattencase planetgearsu 54 roll offon `trol means with the the ring gear and planet gears 52 geared to planet gears 54 and sun gear 44 effect reverse rotation of planet gear carrier 43 therewith reverse rotation of output shaft 26 mounting base 33.

The rotation of ring gear 4| is arrested by a brake band 69 encircling flange 58 of the ring gear. This brake band is one of the elements of a brake arrangement 68 connected by fluid conclutch operating, cylinderpiston-like arrangement 6| to eliminate simultaneous actuation of the clutch operating, cylinder-piston-like arrangement 6| and the brake arrangement 68 as clearly disclosed in the diagram of Fig. 3.

The brake band 66 of brake band arrangement 68 supports at its opposite ends 16 and 1| longitudinally adjustable connecting studs 12, 13, stud 12 being connected to the central portion 14 of a lever 16 pivoted on a pin 13 mounted in clutch housing portion 3 and stud 13 being coupled to the arm 11 of a double lever 18 pivoted on pin 19 also mounted in clutch housing portion 8. The levers 15 and 11 are linked to each other for joint operation by a longitudinally adjustable link 82 connecting the end 86 of lever 15 to the arm 8| of double lever 18. Link S2 is, furthermore, pivotally connected to an operating lever 83 pivcted on a pin 16 mounted in housing portion 8, which operating lever 83 has its free end 84 con- 1 ected with the piston 85 of a cylinder piston arrangement 66 adapted to effect downward movement of lever 66 to tighten the brake band 69 on flange 56 of ring gear 4|. In inactive state the cylinder' piston arrangement 86 permits opening up of the brake band 69 by a compression spring 61 so as to release the grip of the brake band on flange 56. n

The planetary transmission mechanism is actuated by the cylinder-piston arrangements 6| and 66 controlled by the four-way valve structure 83 having an intake 89, a rotary valve 9| and outlet passages 96, l92 and 93. Outlet passage 96 communicates through pipe 65 with cylinder piston arrangement 6|, outlet passage 92 cornmunicates through pipe 92 with cylinder piston arrangement 86, and outlet 93 communicates with a fluid sump 95 in housing 2. In order to effect a forward rotation of output shaft 26, valve 9| is rotated to the dotted line position (see Fig. 3) in which position intake 89 communicates through outlet 96 and pipe y6d with cylinder piston arrangement l6| and cylinder piston arrangement 86 communicates through pipe 92 and outlets 92 and 93 with the huid sump 35. Reverse rotation of output shaft 26 is effected by rotating valve 9| to the dash-dotted line position, in which position intake 89 communicates through outlet 92 and pipe `92 with the cylinder piston arrangement 66, and cylinder piston arrangement 6| communicates through pipe 65, outlets and 93 with fluid sump 55. Rotation of output shaft 26 can readily be stopped when valve 9| is rotated to the full line position in which the valve cuts on supply of pressure iiuid to the two cylinder piston arrangements 6l and 86. Fluid for actuation of torque converter 1 and the two cylinder piston arrangements 6| and 86 is supplied from pump 94 coupled with and driven by input shaft I4. This pump has its intake 96 connected by pipe line 91 with sump 95 and its outlet 98 connected by pipe line 99 with the intake passage |68 of torque converter 1. The pipe line 99 has extended therefrom a pipe line |0| coupled with the intake `89 of theVfour-Way valve structure 88 and supplying from pump 94 pressure fluid necessary for the operation of cylinder piston arrangements 6l and 85.

Having thus described my invention, what I claim is:

1. In a transmission a tubular drive shaft, a driven shaft freely rotatably extended through the drive shaft in axial alignment therewith and a reversing transmission of the planetary type coupling the drive shaft with the driven shaft, said reversing transmission including a sun gear at one end of said drive shaft, a ring gear freely rotatably and axially non-shiftably mounted on said drive shaft adjacent to said sun gear, a planet gear carrier rigidly mounted on the driven shaft, sets of cooperating planet gears on said planet gear carrier, friction clutch means mounted on said driven shaft and ring gear adapted to releasably couple the ring gear with the driven shaft, stationary brake means encircling the ring gear and adapted to arrest rotary movement of such ring gear, and hydraulic actuating means for said friction clutch means and said brake means adapted to directly and selectively actuate the friction clutch means and the brake means for selective forward and reverse rotation of the driven shaft.

2. In a transmission a tubular drive shaft, a driven shaft freely rotatably extended through the drive shaft in axial alignment therewith and a reversing transmission of the planetary type coupling the drive shaft with the driven shaft, said reversing transmission including a sun gear mounted on the inner end of the drive shaft, a ring gear freely rotatably and axially non-shift ably mounted on the drive shaft, a planet gear carrier rigidly mounted on the driven shaft, sets of cooperating planet gears mounted on the planet gear carrier and coupling the ring gear with the sun gear, stationary brake means encircling the ring gear adapted to arrest rotation of the ring gear, frictional clutch means adapted to couple the ring gear with the driven shaft, said clutch means including cooperating, shiftably supported clutch disks on the planet gear carrier and the ring gear, said planet gear carrier being formed with a backing-plate-like portion adapted to back-up the said clutch disks when actuated upon, and hydraulic means adapted to selectively, alternately actuate the clutch means and the brake means for selective forward and reverse rotation of the drive shaft, said hydraulic means including a cylinder supported by the planet gear carrier arranged opposite the clutch disk of said clutch means and a piston adapted to engage and shift the clutch disks for actuation of such clutch means.

3. A transmission as described in claim 2, wherein the planet gear carrier embodies a. sleeve-like base rigidly mounted on the driven shaft, wherein said base includes at one end a circumferential flange having the sets of cooperating planetary gears extended from the outer face, Aand wherein said base includes in axially spaced relation with respect to its flange a flanged disk forming the cylinder of the hydraulic means and shiftably supporting the piston thereof.

4. A transmission as described in claim 2, wherein the planet gear carrier embodies a sleeve-like base rigidly mounted on the driven shaft, wherein said base includes at one end a. circumferential flange having the sets of cooperating planetary gears extended from the outer face, wherein said base includes in axially spaced relation with respect to its forming the cylinder of the hydraulic means and shiftably supporting the piston thereof, and wherein the sleeve-like base supports axially aligned therewith a spring member adapted to yieldingly force said piston into the cylinder of the hydraulic means.

CHRIS GERST.

References Cited in the le of this patent UNITED STATES PATENTS flange a flanged disk` 

